Malicious PDF — malware analysis report

Static analysis result for SHA-256 be65cf54b6548ccb…

MALICIOUS

PDF

97.2 KB Created: 2021-09-18 10:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f22450924696c270f9f8f047483cb168 SHA-1: 9c4b648cfe86f2b248a7ecec007c10fc649ead95 SHA-256: be65cf54b6548ccb700352d352b0e40073b3e75fffd475fe8a9767265d94f78e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://apexsafetyproducts.com/ckfinder/userfiles/files/78429454982.pdf In PDF document text
    • http://puisan.ru/uploads/file/92474376954.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/sapuwesikujejezuvopoji.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/buzurowedekofakaxi.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/21247337191.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7c9c7ac633208057d07e7e43bb08ab21/legibiw.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/14607519748.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/vavosazo.pdfIn PDF document text
    • http://art-ball.net/files/file/3932585590.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/kokew.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ntj9mn4elhhkkp5jg8cngaika1/10017954479.pdfIn PDF document text
    • https://ags-car.com/upload/files/tuturuluzotoz.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/xibatavoxon.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/vizowega.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/sajarijojepi.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/22561012908.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/ruzugivera.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369ea4868f5---sajebupilowadow.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/jipuxexifuxug.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/garemuxanupijufusiju.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/terofo.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143bc37c184f---35264328410.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/52272774477.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/sotoviminemakire.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/84402484619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=kitab+al+azif+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11003 10060 bytes
SHA-256: 2f25158a0a3942998c57ac9f7d9f3fb58f2bfce3af6e5ed1929512da845ec8b0
font_01_sfnt_off00012640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E52 21872 bytes
SHA-256: f38af21f0a5e14f7775d7d45b65b2914fdc85425e2c76964bd4bf8a3f9d71547

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